The trade appears to of been 1 black -700 for 2 cyan. The cyan going to yesyes and the black going to dealghost. Dealghost had 3 black and brown so this was good for him, yesyes owned 3 white and had some cash remaining to start building cyan. It was late start 60 and pushing it, but I cannot rule this as a cheat trade as it appears to be fair at giving both users a good chance of improved end ranks.
Now as for yesyes leaving the game, I cannot tell what caused this or why he did, but the trade was fair so cannot be ruled as a cheat.